I have now done the full formula to see what happens...the formula is:
=((DATEDIF(D4,E4,"Y"))+(DATEDIF(G4,H4,"Y"))+(DATEDIF(J4,K4,"Y"))+(DATEDIF(M4,N4,"Y"))+(DATEDIF(P4,Q4,"Y")))&" years "&((DATEDIF(D4,E4,"YM"))+(DATEDIF(G4,H4,"YM"))+(DATEDIF(J4,K4,"YM"))+(DATEDIF(M4,N4,"YM"))+(DATEDIF(P4,Q4,"YM")))&" months "&((DATEDIF(D4,E4,"MD"))+(DATEDIF(G4,H4,"MD"))+(DATEDIF(J4,K4,"MD"))+(DATEDIF(M4,N4,"MD"))+(DATEDIF(P4,Q4,"MD")))&" days"
I get the answer 12 years 29 months 69 days
I'm a little confused...I had calculated the difference as 14.62 years before...which if you work it out this is what 12 years 29 months 69 days is?!!!???!!! What on earth have I done?