Both people need to have a desire to be together and commit to each other. If you want to date other people or aren’t ready to get tied down yet, you won’t be able to enjoy all of the benefits of being in a relationship and having a committed partner. While commitment takes away some of your freedom, it’s worth it when you find the right person.
Some people are old at 18 and some are young at 90. Time is a concept that humans created.