I'm 44 and single. I have a 2 month old baby. It's work, but it is doable. I am on 'maternity leave' right now but I'm working from home constantly to stay on top of things. I think it will actually be easier when I go back into the office full-time and have my hands free 9 hours per day. That said, I'm staying home for another month as I need to do this for my baby and myself to bond properly and get his immune system a bit more mature before he goes to daycare.
I do have some family that comes in here and there to help me 10-15 hours per week, and I did hire a very expensive baby nurse a few nights per week during weeks 2-5. She was great and it was worth the $$!! I got to sleep all night.
At this point, my LO will go to bed either at his 8/9pm feeding or 10:30/11pm feeding (it's regulated by his eating patterns of the day), and will wake up about every 3-4 hours. So, if I put him down around 10pm, I'll have to get up from ~ 2am-3am for an hour, and then he wakes up for the day between 6-7am. Not bad. The first month was pretty rough but it passes.
Okay, this is long winded. You can do it. Honestly, it's totally worth it! Also, I'm an exerciser and somewhat vain
- I now have a home eliptical and free weights. I also take my baby on 2-3 mile walks at the park. It can all be done. Your life will be different, but isn't that what you want?