Look, they didn't tell you not to do an MD, so age alone is not the issue.
The big issue I see with starting an MD/PhD so late is that you are essentially preparing for a career as a research scientist, but you are way behind the pack. In research, everything depends on funding. In getting your grant proposals funded, everything depends on who you know, your/their reputation, and your possibilities for doing great future work. As a 46-yo just starting out in any research field, with a few publications and little or no history of successful performance with funded grants, you are going to have a hard time convincing anyone to hire you for a tenure-track position at an age where you're thinking about starting a familyYes, if you are a rare superstar you might make it work, but for the average person it will be a really hard time.
Perhaps you envision a career in industry, but still the youngsters will have a huge advantage, unless you again have some exceptional qualities that make you stand out.
Find out why these people are discouraging you. Perhaps it has nothing to do with you and a lot more to do with the ugly realities of research funding.
I have a little time on my hands so I thought I'd tinker around a bit with posts.
"The big issue I see with starting an MD/PhD
as a woman is that you are essentially preparing for a career as a research scientist, but you are way behind
other women who choose careers with shorter periods of training and desire to be parents. In research, everything depends on funding. In getting your grant proposals funded, everything depends on who you know, your/their reputation, and your possibilities for doing great future work. As a
woman of childbearing age just starting out in any research field, with a few publications and little or no history of successful performance with funded grants, you are going to have a hard time convincing anyone to hire you for a tenure-track position
when you're at an age where most women are thinking about starting families. Yes, if you are a rare superstar you might make it work, but for the average person it will be a really hard time.
Perhaps you envision a career in industry, but still the
men will have a huge advantage, unless you again have some exceptional qualities that make you stand out.
Find out why these people are discouraging you. Perhaps it has nothing to do with you and a lot more to do with the ugly realities
of being a woman interested in an MD/PhD."
I guess I'm having a hard time understanding why age is an issue when other things which are proven to be more significant issues in who uses their training don't seem to be with the point being that NONE of these things should be issues.