It will, however, likely start to become more difficult when issues around retirement or health problems arise.
While it’s probably tempting to come up with some sort of lie that will make cutting him off a little easier on both you and him, honesty is really the best policy.
If you’re just not romantically interested in him, say that.
Financial, health and economic factors also change as we grow older and these can sometimes make child rearing more difficult in later life.
If having a family isn’t part of your future plans then there are examples of many happy and healthy couples who have age gaps of 10 – 20 years.
Anything over 25 years does begin to raise problems in terms of compatibility because you are effectively from different generations and therefore your life experiences, beliefs and values may be so vastly different that it can cause difficulties when you negotiate important decisions in your relationship.