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The elective deferral (contribution) limit for employees who participate in 401(k) is $17,500. So that is your limit.There is no limit for contributions as long as you are working so your age is not a factor.
You can continue to make contributions, as long as the plan allows.
As far as contributing to a spousal IRA that depends on your wife's age. If she is 70 1/2 no contributions would be allowed for her.
You can’t make regular contributions to a traditional IRA in the year you reach 70½ and older. However, you can still contribute to a Roth IRA and make rollover contributions to a Roth or traditional IRA regardless of your age.
If her IRA ia a ROTH then yes but not if it is a Traditional and she is 70 1/2 or over.
As she is 50 then contributions would be allowed.
As long as your income is $95,000 or less you should receive a full deduction for the IRA contribution made for your wife, even if you are covered by retirement at work.
To summarize : Yes to all of your questions.
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