Nowadays, people believe that marrige at young age will give them many benefits,
.... is that so? I thought people now tend to postpone marriage compared to older generations.
especially for Eastern because they have an opener-awareness in this issue than n the past.
... you need to re-write this part;
especially in the Eastern world because .. .... (I cannot understand what you are trying to say with the latter part)
An early marrigemarriage will give husband and wife a chance to spend a longer time to stand by and have more unforgetable memories.
An early marriage gives the husband and wife a chance to spend their lives together for a longer time and cherish more happy moments and memories.