I really enjoyed the aging mechanic. It's an interesting take on player health where having full health is not the most advantageous. Like the others, I did fall through the floor during the second level and the boss level. During the boss level, I fell through the floor when the boss swiped at me, and I was directly underneath its foot. It happened three times and was a little demotivating. I did end up completing the game, though!
The quit game button on the main menu did not work for me, so I just closed it manually.
I found the aging mechanic very unique, and I enjoyed playing around with different ages to progress. Well done!