My mother was a grandmother before she had me. It has not affected my life in any way whatsoever except having a nephew who is 6 months older than me. My other nieces are a couple years younger and we are very close. I was spoiled rotten by my older siblings and my mum was very capable, as was my father. My mum still works, as does my dad. Dads health is failing (heart disease and diabetes) but he is still very active. Mum claims having a child when older has kept her young!
Personally, I am waiting until I am married before having a child. Myself and my partner enjoy a very good lifestyle at present and are not quite ready to give it up. I want to ensure I dont have to work whilst my children are young. My life is planned out for the next few years which involves paying off some debts and putting away some money for myself so I dont have to rely entirely on my partner. I dont take for granted that I will be able to have a child, and given the option to freeze some eggs I would jump at the chance as I dont know what is ahead of me.