How do you respond to “when are you going to have kids?!”

My husband have been together for over 10 years and started TTC a few months ago. It’s becoming more difficult when friends/family say things like “time for you to start tracking your cycle and get going on that baby making!” Or when the in-laws keep mentioning they want to be grandparents before they get “too old” 🙄

Prior to us actively trying, the standard response was that my husband is in school and we don’t want him to have to choose good grades over being an involved father. However, he finishes class in May (which is a large part of why we are now TTC). Lately my husband has started (half jokingly) saying “none of your damn business” 🙅🏽‍♂️but that doesn’t seem to get people (especially his parents) to back off as effectively as we’re hoping.

Any tips on what to say? 🧐