The longer a person has been "dating" without settling down, or been in a failed marriage or two, the less likely that person is a long-term suitable partner compared to baseline. Of course the difference in likelihood may not be all that great, and if you find a partner who gives you other reasons to think they are suitable for you, you should go ahead.

But, to think that the population of people who have already demonstrated a lack of either desire, or ability, or both, to form a lasting intimate relationship with another human, is a better sample to draw your prospects from, than those who have not demonstrated these qualities yet, is a basic arithmetic fail.