Thanks for the questions...
I delegate a pretty healthy chunk to leo voter. 50,000 HP for the 100 plus LEO a day.
LEO staking works sort of like Hive staking. You earn from curation. So the more LEO you have staked, the more upvotes you give out and earn from curation.
Curation on Hive and LEO are essentially 'liking' other people's content. We receive an APR for distributing the tokens out to people in the form of voting. Which is called curation on chain.
Oh gosh, no worry about that. Age isn't anything but a number on chain!
Hope this helps.