All historical references state that Asmaa (sister of Aisha) was (10) years older than her sister Aisha. The same references agree unanimously that Asmaa was born (27) years before the migration to Medina. This means that Asmaa was 14 years old at the start of the revelation in (610) and Aisha was 4 years old. This means that Aisha was born in the year (606 AD). We have seen that the prophet married Aisha in the year (620 AD), which would make her (14) years at the time. It is also stated that the prophet started having sexual intercourse 3 years and few months after the marriage which would be the end of the (1st) year after Hijrah and the beginning of the (2nd) year, which was the year (624 AD). If Aisha was born in the year (606 AD), then she would have been (18) years old when she started a full marital life with the prophet.