4 years gap...people saying age doesn't matter..I think it matters..a 20 year old cannot marry 30 or above age..there might be a conflict as you see she might not be that matured, even if she is matured she will always have to meet the needs of her hubby since both will have different mindset and one will be too matured...I personally prefer 4 to 5 years they can be matured one can teach other and also be playfull so there is love , fun and a couple can enjoy their life..