The 25th year of life is ruled by Venus. Venus rules the wife in male chart and Husband in female chart. Venus when posited alone generally gives good results.
When ever Mercury is placed before Venus in a Horoscope, it is considered auspicious for the native. But when Mercury is malefic and posited before Venus, it gives affliction to Venus and native suffers on account of family life. When Mercury is in conjunction with planets inimical to Venus (Sun, Moon, Rahu), Mercury can not afflict Venus.
Sun and Saturn together can adversely affect spouse of the native.
When Rahu afflicts Venus in a horoscope, native suffers on account of wealth and spouse. When Venus is placed in inimical house and Rahu is placed in adjacent house, it will again afflict Venus.
Venus in first House
Venus in first house can give mix results depending upon overall planetary position and strength of Saturn. Native may be atheist and highly passionate. He will be benefited from the government and he will enjoy luxuries and comforts of life. He will possess vehicles. Native may involve himself in extra marital affairs with person of opposite sex who may have very ordinary looks and tend to compromise in character despite his spouse may be very beautiful / Handsome. He / she may get married before starting his / her career when Saturn is well placed in the horoscope. When Mars is placed in 6th, 7th or 12th house, native has very long life.