I think old psychology teachings say 30 is the age u should be ready. Long story short, that's when u gotten enough to want to start your own.
I'm 30 and have no interesting settling. Want more things for myself before I share it with anyone else. Nobody I know is comfortable in their relationship except my parents, who've been together for 40 years.
as for people mentioning "too old/young" In most Buddhist practices, u're a youth until u're 45. Before then, u struggle sometimes, and may suffer now and then, but overall grow spiritually, and then can enjoy your peaceful old ass life lol.