Few things take note of in relationships:

1. Every relationship has an age - sometimes 5 years and sometimes 50 years. There is no comparison here.
2. You may have multiple relationship over your life or one dedicate relationship. All is fine.
3. You are not your past. You learn from the mistakes and you become better. That is the natural flow. So don't be tough on yourself - maybe it was your mistake. Learn and move on.

That's it....see ya