That goes for any relationship. Men and women. It is harder the older as so many more are paired, and the single ones have a higher likelihood of having… reasons.
Or just baggage, which isn’t particularly healthy for your mental state. When looking at my circle of friends, at the latest when your ~35 you will have lived through cheating or other types of betrayal. People often are just assholes to each other and hurt people hurt people.
I see this as an additional reason though, to not date someone who is still very young.