[walkon]

And when we say a lifetime of memories, we really mean it. With Google Photos, you can now backup and store unlimited, high-quality photos and videos, for free.

In Google parlance, a (free product) lifetime is somewhere between 2 - 7 years.

<edit to add>

Looks like the unlimited free storage is for high quality, but not original, versions of the images and videos. Original quality is subject to storage limits/pricing:

https://support.google.com/photos/answer/6220791?p=storage&r...

With some sort of revenue, maybe this product will be sustainable.

[Chevalier]

I believe that page is outdated as of today. Until now, G+ stored pictures up to 2000px for free. As of today, photos of up to 16 megapixels may be stored for free.

[microtonal]

But they can recompress it according to the help pages. If you want to store the originals, it's counted towards your space.