I’m 47 and I would not want to be caring for a 2yo (or, frankly, a 4yo). I’m fit and active but very much more aware of higher levels of aches and pains than even 5 years ago, being more introverted, more tired, and really enjoying the freedom to pursue my own hobbies and interests. Perimenopause is a real thing and at 42 I didn’t realise the effect it would have on me.
I also can’t imagine wanting or being able to meet the needs of a teenager in my 60s.
Then there is the question of health expectancy- I have known fit and well 60yo who were dead at 66. Sorry to be blunt, but that’s a factor. It’s always horrible when we lose people we love, but losing a parent has got to be worse if you’re 21 than if you’re 31 or 41.
Then there are the higher risks of having a child with additional needs, a more difficult/higher risk pregnancy and birth, plus the impact on your existing child and your relationship with them.
So overall I would say count your blessings and get a kitten, or an allotment, or something else to fill the hole you perceive in your life; and don’t try for a baby.