Any advice? Similar situation??

Steffi • Have 3 amazing children. 2yrs-14yrs . X
Hi. 
I have a 12yr and 10yr old, with my new partner a 7 month baby. I would love another tho am 43. My partner would love another but worries it will upset my older too to much and because we have a healthy baby thinks the next my be damaged due to our age. He is reluctant to try now. 
I love being pregnant and babies being a mummy the whole package. My older two have been thro a difficult time there father is domestically violent tho they love our baby so much. 
Any thoughts should we chase our dreams or cut our loses and feel blessed 
Thank s