I have a Master's degree, two years of research experience followed by an industry job for a few years. I had always intended to do a PhD eventually but the jobs were interesting, and later COVID messed up things. I now have a research heavy industry offer where I'll get a rare opportunity to help build up a lab from scratch, but I'm nervous about giving up on applying to PhD positions. Will lack of a PhD harm my career later on in spite of research experience? If I were to apply for a PhD position later on around the age of say 35, will my age work against me?