If you were to compare the portfolios of retirees and millennials you will most likely find them to be inherently different. Portfolios should be shaped to meet the goals of the investor. A retiree may wish to gain an income from their investments, whereas a millennial may look to build up their wealth as much as time permits.

With a longer investment time horizon millennials can afford to be more aggressive with their choices. I believe the following five shares would be good picks for millennial investors seeking strong share price gains:

Blackmores Limited (ASX: BKL)

Few could have imagined the meteoric rise of Blackmores in 2015. It provided its shareholders with a 525% rise on the back of overwhelming demand from the Chinese market. If this demand persists and the company can become a trusted brand in China then I see no reason why this rapid growth cannot continue for some time. I believe this is definitely an investment for those with a higher tolerance for risk.

Carsales.Com Ltd (ASX: CAR)

I believe Carsales is a company that could easily double in size in the next decade. Its growing overseas operations gives it a collective audience of almost 750 million consumers. If these operations can have half the success it has had at home, then investors will be seeing fantastic long-term gains.

iSentia Group Ltd (ASX: ISD)

As one of the world’s leading media intelligence companies, iSentia is another potential investment for millennials. It provides media monitoring, tracking, and analysis services for massive multinational companies such as Nike, Starbucks, and Disney. According to CommSec, the market is expecting earnings growth of over 40% per annum for the next two years.

SEEK Limited (ASX: SEK)

Much like Carsales, I believe SEEK is another company which could double in size on the back of its international expansion. Its international segment includes investments in leading employment portals in China, South East Asia, Brazil, and Mexico. The early signs have been very positive in these markets which have a combined population of over four billion. SEEK’s international revenues increased 34% to $298m in its latest half year results.

Vocus Communications Limited (ASX: VOC)

An investment in the highly ambitious Vocus Communications could be a great one for millennials. Its merger with M2 Group Ltd (ASX: MTU) and the acquisition of its rival Amcom means Vocus is positioned extremely well to battle for market share with its rival TPG Telecom Ltd (ASX: TPM). The market is expecting earnings to grow by 33% per annum through to 2018, which could provide shareholders with sizable gains.

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Motley Fool contributor James Mickleboro has no position in any stocks mentioned. Unless otherwise noted, the author does not have a position in any stocks mentioned by the author in the comments below. The Motley Fool Australia has no position in any of the stocks mentioned. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.