in case of 28 days regular cycle usually ovulation occurs around 14th day, so as you had intercourse on 9th day of cycle,
there is less possibility for pregnancy
but that could not be completely excluded,
male age usually will not affect spermatozoa
as they will be continuously produced unlike females around 3 days of abstinence is enough for good quality of sperms,
so if you miss your due date in the next cycle you undergo blood test
or urine test to detect the possibility of pregnancy.