Astrological Reasons : A man marrying an older woman

In man's  natal horoscope 

if 

1.lord of 7th house is placed in a quadrant 

and 

2. Jupiter is not sitting  in quadrant

Then there's a possibility of the native marrying an older woman, and after marriage, his situation gets sudden changes and he will receive tremendous happiness and money and improvement in career after marriage.  

Sachin Tendulkar horoscope : 

1. Sachin Tendulkar is 6 years younger than his wife Anjali.

2. In his horoscope, lord of 7th house Saturn is placed in quadrant ( 10th house ) 

3. Jupiter is placed in 6th house, not in a quadrant.    

Nick Jonas horoscope : 

1. Nick Jonas who is recently engaged to Priyanka Chopada is 10 years younger than her, also he had a history of dating older women earlier.
2. In Nick's horoscope lord of 7th house is Jupiter, which is placed in 4th house ( quadrant )
3. As we see in his horoscope Jupiter is placed in a quadrant as lord of 7th house, so the second condition of yoga is not fulfilled completely hence the stability or sustenance of the marriage is questionable in this case.