Yes, expenses for both can be withdrawn if you did not itemize them as medical deductions on the tax returns. Here is a thread that goes down the rabbit hole of HSA withdrawals and itemizing medical expenses.
http://www.early-retirement.org/forums/f28/distributions-from-an-hsa-88977.html
We haven't itemized for a long time so that's not an issue.
Right now we have a little over $3200 in DHs HSA. $2300 of that is what's leftover from 2014+2015 contributions minus reimbursing us for 2014 expenses. The other $900 is growth.
I'll add $4450 ($3450+$1000) to DHs HSA and open another one for me and contribute up to $4450 ($3450+$1000) to mine.
Our expenses since we started the HSA in 2014 have been
2014 $12,856 (HDHP, $7550 HSA contribution)
2015 $ 4,711 (HDHP, $7650 HSA contribution)
2016 $ 2,053 (non HDHP, no HSA contribution)
2017 $ 1,179 (non HDHP, no HSA contribution)
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Total $20,799
Total contributions $15,200
Withdrawn in 2015 $12,856
If I open my HSA in 2018 I can only withdraw expenses (for either of us) from 2018 or later, correct? But DH's HSA can be used for most of the older expenses because it has been open since 2014.
My plan is to leave what I can in the HSAs, but I'd like to be sure just in case.