RPGMemes

I don't know if 5e has starting age tables? 3e and Pathfinder do, it's an optional character creation thing that helps show the general age of most things. It starts off with the starting age of a given race and then has a table with different classes and dice. So for a human the starting age is 15, Barbarian/Rogue/Sorcerer is 1d4, Bard/Fighter/Paladin/Ranger is 1d6, and Cleric/Wizard/Monk/Druid is 2d6.

So a typical cleric starting age would be 16-27. At that point they are a level 1 Cleric and have a grand total of one level 1 spell per day. 5e is more generous and gives them two level 1 spells per day.

That spell should do a lot, and in a small village would be amazingly effective, but at a certain point there just aren't enough spells per day for everyone. It should actually be hard for adventurers to get healing because the local cleric should probably have spent all his healing for the day by the time they get to him, he can probably squeeze them in tomorrow when he's recovered spells.