Here's my 2 cents worth...female, age 59, widow, NO KIDS by mutual choice. I was harassed plenty about not wanting/having any kids (never by my family, though...they knew how I felt). My college roommate flat-out said I was "selfish" for not wanting any. I said it was more selfish to have kids you didn't really want simply because society said it was "normal" to want/have them. She also tried the "who will take care of you in your old age?" thing. Believe me, I know plenty of people whose kids would stick their parents in a home rather than take care of them themselves.
Fortunately, I recognized early on that I didn't have the interest or patience required to be a good mother. There are enough children out there who are suffering for being born to parents who never should have had kids.
Even though I'm "alone" now (for 14 years), I don't regret the choice one bit! So, it comes down to...what do you want (or not want, as the case may be)?