linguistic:paraphrasing, linguistic:voice_change, information:classification
Demographics

Since the Neolithic period, the demographics of Lithuania have stayed fairly homogenous. There is a high probability that the inhabitants of present-day Lithuania have similar genetic compositions to their ancestors, although without being actually isolated from them. The Lithuanian population appears to be relatively homogeneous, without apparent genetic differences among ethnic subgroups.

A 2004 analysis of MtDNA in the Lithuanian population revealed that Lithuanians are genetically close to the Slavic and Finno-Ugric speaking populations of Northern and Eastern Europe. Y-chromosome SNP haplogroup analysis showed Lithuanians to be genetically closest to Latvians and Estonians.

In 2021, the age structure of the population was as follows:

The median age in 2022 was 44 years (male: 41, female: 47).

Lithuania has a sub-replacement fertility rate: the total fertility rate (TFR) in Lithuania was 1.34 children born per woman in 2021, and the mean age of women at childbirth was 30.3 years. The average age of first childbirth for women was 28.2 years. The human sex ratio is male leaning for the age categories 15–44, with 1.0352 males for every female. As of 2021, 25.6% of births were to unmarried women. The mean age at first marriage in 2021 was 28.3 years for women and 30.5 years for men.