how depressing. what do they have to say about what joy to derive from life?
Buddhists celebrate and actively cultivate joy (pīti, a stimulating and joyful mental factor that you develop through meditation). For lay people, any wholesome kind of joy derived from life that doesn't lead to craving and addiction is also considered good.
But seriously it can be the opposite of depressing. Instead of hating getting old, you realise it is like hating that the sky is blue and then you can enjoy it.
You don't focus on these realities and stop there. You move past them, with a clearer mind.