The Rahu mahadasha is for 18 years and hence 18 years of any person cannot be the same. A lot will depend upon the vimshottari dasha and gochar. The native enters Rahu mahadasha on 4th August 2018. Rahu at present is in his 7th house as it is transiting through Cancer. Certainly, this period is not good on the marital front.
Blessings,
Navneet Khanna
Astrologer