If you want a child, then go for it. You'll figure everything else out. Will it be easy? Probably not. Which would you regret more? Having the child and readjusting your life, or not having a child and realizing later that you should have?
I'm not AEA, and I SM community theatre about once a year. Not as rigorous of a schedule as professional theatre, but I wanted to give you my take since I am a mom....I have a 5 year old daughter and I'm pregnant with baby #2. I stay at home during the day, and rehearsals are generally 3-4 times a week for 2-3 hours. I stage managed earlier this year--rehearsals were during my 1st trimester, and performances during the 2nd--and I found that "morning sickness" (which I didn't have with my daughter) affected my work. My energy and stamina were way down also. I was fortunate that with this show I could sit in the booth, call my own cues and run the light board during the shows. (Last year I was backstage, helping to move furniture and props on/off stage) This was one of the easiest shows that I've SM'd, but in some ways, it was the hardest. Our all day tech was difficult since I was dealing with the tail end of the nausea. Peanut Butter, which I normally like, is a nausea trigger for me right now....and one of the characters had to eat a PB sandwich. I couldn't even watch that part of the scene--thank goodness there wasn't a lighting cue there.
Taking time away from the baby/toddler/young child will be more difficult than when the child is older. As the child grows he/she will need less constant attention/supervision. But then the child will get into soccer, dance lessons, etc. You and your husband need to make sure that you're both willing to give the needed time to the child, whether it's chauffeuring to/from a lesson, or just spending time playing.
My daughter actually got upset this year when my show ended and I was home more in the evenings....she wanted the one-on-one time with Daddy.
And about the age 35 cutoff....unless there's some specific medical issue with your body that your ob is concerned about, please don't take that as a deadline. Lots of people have had children past 35....I'll be 37 in October. (Baby is due in late August)
Bottom line, do what's right for you, and your husband.