I had my two sons at 41 and 44. Now they are 10 and 6. I think 45 to 50 is really the start of mid life. 63 is the start of seniors. I'm definitely not alone or lonely at my age, with three young children and lots of noise around.
At 40 to 50, family is the priority, children are the center of everything. Sometimes I'd like to be left alone!
