Aging question

[dmxcasper2]

	A	B	C	D	E
1	Date Action Was Opened	Commitment Date	Re-Commitment Date	Late to Commitment Aging
2	11/15/2018	12/10/2018	12/12/2018
3

<tbody>
</tbody>

Problem Statement:
Today's Date minus (oldest date of Column B and C, if only one date exists in either of those columns, use that date.)

The sum of this calculation would be in cell D2.

 

[Fluff]

maybe
=TODAY()-MIN(B2:C2)