The gemorah that says trying to look younger is beged isha is in makos 20b.
http://www.hebrewbooks.org/shas.aspx?mesechta=25&daf=20b&format=pdf
See Ein Mishpat for where it is brought l’halacha.
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The gemorah that says trying to look younger is beged isha is in makos 20b.
http://www.hebrewbooks.org/shas.aspx?mesechta=25&daf=20b&format=pdf
See Ein Mishpat for where it is brought l’halacha.