Third Act is reimagining what elderhood can mean for millions of Americans. Donate today to help protect our climate and strengthen our democracy.

Third Act is a national effort to organize older Americans helping protect our climate and safeguard our democracy. We’re stepping up and using our strengths as a generation to get to work taking collective action for progressive change, building a skilled, joyful, committed base of volunteers along the way.

We don’t need endless sums of money to build a strong Third Act presence—most of us are going to be volunteers; there’s no question that your willingness to work is more important than your ability to give. But if you can, please consider both!

We do need some funding, because a small full-time staff will do the organizing work to make those volunteer hours count for much more as we take on climate change and defending our democracy. So if you have some money to offer, we will put it to good use.

You can use the form here to donate; or if you’d prefer to send a check you can address it to Third Act Initiative and send it to the following address:

Third Act
PO Box #445
Nassau, NY 12123

Donations to Third Act via ActBlue are not tax-deductible. Your contributions here help us build grassroots power and come out on the sharper end of political discourse during election years. If you need to make a tax-deductible donation, want to donate via DAF, or for more options—please see our FAQs below.


You can. Third Act remains fiscally sponsored by the Sustainable Markets Foundation, a 501(c)(3) organization. Donations here help fund our non-electoral work, and are fully tax deductible.

You can make a tax-deductible contribution below:

Or if you would prefer to send a check by mail, you can make it payable to Sustainable Markets Foundation with “Third Act” in the memo line, and post it to:

Sustainable Markets Foundation (Third Act)
45 West 36th Street, 6th Floor
New York, NY 10018-7635

If you would like to donate to Third Act through your Donor Advised Fund (DAF), you can do so via Sustainable Markets Foundation, our 501c3 fiscal sponsor. Here’s the information you’ll need:

  • EIN number (tax ID number): 13-4188834.
  • Address: Sustainable Markets Foundation (for Third Act), 45 West 36th St., 6th Floor, New York, NY 10018-7635.

It is usually possible to include “Third Act” in a memo or Grant Designation line. Any further questions should be directed to . Thanks!

Third Act can accept gifts of stock. Please send an email to for instructions about how to begin a transfer.

Yes. We would be honored to work with you to create a lasting legacy in support of a fair and stable planet. You can include us as a beneficiary in your will or estate plans. A bequest is easy to arrange and is not payable until you pass away, so it does not affect assets or cash flow during the your lifetime. It is also private and revocable, since you can change provisions in the will or trust at any time, and it is not made public until death.

If you’re interested in or planning on making Third Act a beneficiary in your will or estate plans please email

Third Act is a recognized partner of 1% for the Planet. If your business is interested in donating through that program, you can find us in their non-profit directory, or by writing directly to Gabi Freeda at

Ways to get involved

Join our mailing list

The best way to start your third act is by signing up for our mailing list. We'll update you on our campaigns, actions you can take, and other relevant news and insights.

Take action

You have the power to be a catalyst for change. We organize different actions, online and in-person. Once click can make a difference!

Find a Working Group

Working Groups are volunteer run groups organized by affinity or by geographic location. We encourage these Working Groups to carry out organizing, communication and campaigns.

Attend an event

We host workshops, community calls, and facilitated conversations each month that build skills, deepen interest, and get everyone working together on the big problems of our time.