It depends on two things.
One is if your offspring are / is out of the house completely. If he or she / they're not, don't start dating. You risk hurting them further with a new relationship that's statistically, very vulnerable to failure as well.
Now, if you've no offspring, the next question has to do with whether your heart is healed up enough from the divorce to "put itself out there" once again.
How do you know if your heart is healed up enough?
Imagine your divorced spouse reaching out to you, asking for an audience. How do you react to this? Do you feign her return and in turn imagine this requested meeting being a segue into that sphere? If so, your heart's absolutely not healed up enough to "put itself out there".
A caveat to this is as follows: Hearts take a long freaking time to heal. Much longer than we'd like. And also, no heart heals up completely from divorce.
