Age is a factor and goals are a factor, the 1g/lb number is for optimal gains from bodybuilding not the minimum you need to just be alive or healthy

and yeah people who say that protein is easy to get assume that you're eating meat with every meal

on a vegetarian diet you get it from random sources, bread has a little, cheese has a little, it all adds up to the point where you're basically fine especially if you try to include a main protein/meat replacement in every meal (tofu, seitan, chickpeas) but I'm just not a big person and the amount of food I'd need to eat to reach the optimal grams/lb would be too much without supplementation

The recommended minimum is 1.2 g/kg (0.55g/lb)