my age is 32 & my wife age is 26, Now we plan for baby. Can u suggest me which time is best for sex for pregnancy. My wife menstrual cycle start 16th?

Rhythm method. Sex on days close to the ovulation date is more favorable to become pregnant. This is the time which is mid cycle (day 15 or approximately 10 days after the period stops). Start two days before and continue daily for 7- 8 days. The period one week before and one week after the period is least fertile and unlikely to result in a pregnancy...so you can skip this time.