D&D 5E Why penalize returning from death?

[Horwath]

But,

to add to necromancy;

Raising from Dead should come with added natural aging.

So we can add age categories similar to 3E

I.E:
Humans;
Adult: 16
Middleaged: 40
Old: 60
Venerable: 80
Max age: +1d20

Elves:
Adult: 20
Middleaged: 150
Old: 225
Venerable: 300
Max age: +5d20

Now every raising from the Dead ages you by certain amount:

Raise Dead: 15% of your Venerable age
Resurrection: 10% of your Venerable age
True Resurrection: 5% of your Venerable age

That would be +12/8/4 years for a Human and +45/30/15 years for an Elf.


added penalties/bonuses for age categories:

Middle age: -2 to one of str/dex or con. +2 to one of int/wis or cha

Old: -2 to other 2 abilities not chosen in former step. +2 to one of the other two abilities not chosen in former step

Venerable: -2 to str, dex and con: +2 to the 3rd ability in the list.