How old would Tatiana von Metternich-Winneburg be today?

Princess Tatiana von Metternich-Winneburg was a Russian aristocrat, philanthropist, artist, and patron of the arts. She published her books and watercolours under the name Tatiana von Metternich. She supported charity, especially the Red Cross and the Order of St. Lazarus, which she served as Grand Bailiff for Germany. She was a founding member of the Rheingau Musik Festival, made parts of Schloss Johannisberg available as concert venues for the festival and served as the president of its Kuratorium until her death.