dr. engelman just celebrated his 100th birthday and has no plans to slow down.ld you ever consider retiring? >> no. not unless i have to. >> reporter: it would be difficult to exaggerate the changes in medicine in the course of his 75-year career. >> the treatment for arthritis was aspirin. people would come in wheelchairs and gurneys. we don't see that anymore. people walk in. they're not necessarily cured, but they're much better. >> reporter: his advice for achieving longevity is not exactly the wisdom. >> i think exercise is mostly overrated. and totally unnecessary. and the use of vitamins, forget it. and i don't encourage a lot of doctors. >> reporter: so what does he recommend? >> fall in love and get married. sex is to be encouraged. children are a priority. >> reporter: his sons, phillip and ed, are both physicians. his daughter, jill, a lawyer, is married to a doctor, and their son is a physician. aside from medicine, engelman has two great passions. one is music and his phenomenal violin ability. ♪ and the biggest passion -- >> that was our wedding pi