[Python] Grouping data by specific years in python

I want to create a dataframe that is grouped by region and date which shows the average age of a region during specific years. so my columns would look something like

region, year, average age


So far I have:

# specify aggregation functions to column 'age'
ageAverage = {'age':{'average age':'mean'}}

# groupby and apply functions
ageDataFrame = data.groupby(['Region', data.Date.dt.year]).agg(ageAverage)


This works great, but how can I make it so that I only group data from specific years? say for example between 2010 and 2015?

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