I am looking for major companies that have recently celebrated
significant anniversaries (50,100 years,) specifically cosmetic
companies.

Hi! Thanks for the interesting question.

I have found the following cosmetic companies who have recently
celebrated their anniversary milestones and are at least 50 years in
the business. I will list them in the order of their existence.

Avon Cosmetics – 1886
http://www.ideafinder.com/history/inventions/story090.htm 

Kanebo – 1887
http://www.kanebo.co.jp/english/company/e_enk.htm#meiji 

Shiseido – 1872
http://www.nyu.edu/pages/greyart/exhibits/shiseido/history.htm 

Chanel – 1914
http://www.fragrancewholesale.com/somhisandbac5.html 

Max Factor – 1914
http://inventors.about.com/library/inventors/blbeauty.htm 

Helena Rubinstein – 1917
http://www.infoplease.com/ipa/A0772550.html

Elizabeth Arden – between 1908 – 1912 according to the article 
http://www.fragrancewholesale.com/somhisandbac11.html 

L’Oreal – 1907
http://www.loreal.com/us/group/history/history.asp 

Pola Cosmetics (Japan) – 1929
http://www.pola.com/company.htm 

Revlon – 1932
http://www.revlon.com/corporate/corp_ca_history.asp 

Lancome – 1935
http://www.fragrancewholesale.com/somhisandbac12.html 

Christian Dior - 1946
http://www.fragrancewholesale.com/somhisandbac6.html 

Estee Lauder – 1948
http://www.fragrancewholesale.com/somhisbacofe.html 

Search terms used: 
Cosmetic companies list

I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
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Regards, 
Easterangel-ga
Google Answers Researcher