Health

In real life your health grows worse as you grow older so in this game I was thinking that everyone would start off at maximum health but then lose health when they level up but that the increase in defence would more than make up for it. Like they would have less health but it would go down more slowly.

Example:

Level 1

Health: 9999

Defence: 9

Level 2

Health: 9899 (9999/ 100 = 99.99 rounded up to 100)

Defence: 20  (999/ 100 = 9.99 rounded up to 10 + 1 = 11)