A couple of examples would be very useful.
Excel 2010
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<colgroup><col><col><col><col><col><col><col></colgroup><thead>
</thead><tbody>
[TD="align: center"]1[/TD]
[TD="align: right"][/TD]
[TD="align: center"]2[/TD]
[TD="align: right"]5-May-14[/TD]
[TD="align: right"]21-Sep-18[/TD]
[TD="align: right"]4[/TD]
[TD="align: right"][/TD]
[TD="align: right"]0[/TD]
[TD="align: right"]4[/TD]
[TD="align: center"]3[/TD]
[TD="align: right"]10-Oct-00[/TD]
[TD="align: right"]21-Sep-18[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"][/TD]
[TD="align: right"]5[/TD]
[TD="align: right"]5[/TD]
[TD="align: center"]4[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"]10[/TD]
[TD="align: right"]6[/TD]
[TD="align: center"]5[/TD]
[TD="align: center"]or[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: center"]6[/TD]
[TD="align: right"]5-May-14[/TD]
[TD="align: right"]21-Sep-18[/TD]
[TD="align: right"]4[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: center"]7[/TD]
[TD="align: right"]10-Oct-00[/TD]
[TD="align: right"]21-Sep-18[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
[TD="align: right"][/TD]
</tbody>
1b
[TABLE="width: 85%"]
<tbody>[TR]
[TD]
Worksheet Formulas[TABLE="width: 100%"]
<thead>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]
[TH="width: 10"]Cell[/TH]
[TH="align: left"]Formula[/TH]
[/TR]
</thead><tbody>[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]C2[/TH]
[TD="align: left"]=LOOKUP(
DATEDIF(A2,B2,"y"),$E$2:$F$4)[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]C3[/TH]
[TD="align: left"]=LOOKUP(
DATEDIF(A3,B3,"y"),$E$2:$F$4)[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]C6[/TH]
[TD="align: left"]=LOOKUP(
DATEDIF(A6,B6,"y"),{0,4;5,5;10,6})[/TD]
[/TR]
[TR]
[TH="width: 10, bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=DAE7F5]#DAE7F5[/URL] "]C7[/TH]
[TD="align: left"]=LOOKUP(
DATEDIF(A7,B7,"y"),{0,4;5,5;10,6})[/TD]
[/TR]
</tbody>[/TABLE]
[/TD]
[/TR]
</tbody>[/TABLE]